Just installed Linux - doesn't connect to router

[Inazuma]

I've just installed Ubuntu for the first time on a Dell PC. Normally, it uses a Belkin USB Wifi dongle to connect to the router, but with this new operating system installed it can't seem to connect to the router unless WEP/WPA etc are disabled.

I've googled a little and help pages like this and this come up. Problem is, I've never used Linux before and all the jargon goes beyond me.

Any help please?

For the record, it's a Belkin F5D7051

 

[Inazuma]

I am unable to connect the computer via a wired connection like the post says. Any suggestions?

 

[Inazuma]

Hmm it seems to be working now. I really can't figure out what's wrong. Sometimes it disconnects and is unable to reconnect for a while as well.